How is your body able to work against the effects of entropy?
A) Regular exercise B) Eating a balanced diet and proper nourishment
C) Regular work D) Sunbathing
B
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Some bacteria are metabolically active in hot springs because _____
A) they are able to maintain a lower internal temperature B) high temperatures make catalysis unnecessary C) their enzymes have high optimal temperatures D) their enzymes are completely insensitive to temperature E) they use molecules other than proteins or RNAs as their main catalysts
Which of the following is the most likely cause for the sudden sharp increase in atmospheric carbon dioxide levels?
A. natural events, including fires and volcanic activity B. normal fluctuations in the natural levels of carbon dioxide in the atmosphere C. human activities, including the use of fossil fuels, changes in agricultural practices, and deforestation D. respiration from the earth's many living organisms
Cigarette smoking causes ____
a. a decrease in mucus production b. an increase in the number of phagocytes c. slow bone healing d. an increase in the amount of cilia lining the airways e. an increase in the birth weight of newborns of mothers who smoke
Maternal blood and fetal blood are mixed in the placenta
Indicate whether the statement is true or false